My question is regarding "upgrades" not "updates".
As I explained in the original question, I already own Studio One 3 Artist and I have a choice to either Upgrade to Studio One 4 Artist or purchase the rent to own offer from Splice.com for the full version.
However, there is no mention in the rent-to-on literature either here or splice.com, if owners of previous versions get a credit toward their purchase or not.
If I upgrade to S1 4 from my S1 3 Artist version I get a discounted price (more or less the value of the software) but if I purchase it through splice.com there is no mention of any discounts. It's be as if I never owned the software in the first place.